package _0812;

import java.util.ArrayList;
import java.util.List;

public class ListDemo1 {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("one");
        list.add("two");
        list.add("three");
        list.add("four");
        list.add("five");
        list.add("one");
        System.out.println("list:"+list);

        String s = list.get(3);
        System.out.println(s);

        list.set(2, "six");
        System.out.println("list:" + list);

        String old = list.set(4, "seven");
        System.out.println("old:" + old);
        System.out.println("list:" + list);
    }
}
